Rub an apple on your sunburned skin to prevent it from blistering

I got this health tip from a T-Mobile ad in People Magazine(!) during a train ride in Holland.It's very short and to the point. All you have to do is to cut an appple in two and then rub the area of your sunburned skin with it for a couple of minutes. The acid of the apple is supposed to help your skin heal again faster, which is a very cheap and natural cure!A Google search confirms it.I guess right now (November 2008), this tip is suitable for people south of the equator. Hope you guys are enjoying the sun and the coming summer!